Book-rest



"UNITED STATES ,PATENT @Prion CHARLES r. HAYNEs, orBoSToN,MASSACHUSETTS.

lation-REST.`

SPECIFICATION forming part of Lettere Pate To L ZZ whom t may` concern:

Be it known that I, CHARLES F. HAYNES,

a citizen of the United States, residing at Boston, (Brightom) in thecounty of Suolk and State of Massachusetts, have invented certain newand useful Improvements in4 Bool-Rests, of which the following is afull, clear, and exact description, reference being had to theaccompanying drawings, making part of this specificatiominwhich* Figurel is a perspective view of my improved book-rest mounted on anadjustable stand. Fig. 2 is a side elevation, partly in section7 of aportion ofthe same. Fig. 3 is a plan of that portion of therack-supporting frame shown in Fig. 2. Fig. 4e is an enlarged section onthe line 4 l of Fig. 2, showing the clamp which regulates the hinge andsliding friction device of the book-rack. Fig. 5 is a perspective viewof one of the rack-supporting arms. Fig 6 is a view of one of the twopieces which cooperate with the ring at the end of the rack-supportingarm to form the hinge and sliding friction device for holding the rackin the desired position.

My invention is designed to improve the construction of the book-restfor which Letters Patent of the United States No. 289,652 were grantedto me December 4e, 1883, and has for its object, irst, to provide ametal framework of peculiar construction on which to hinge the book rackor racks, and, second, to more perfectly control the hinge and slidingmovements of the racks. e

To this end my invention consists in certain novel features andcombinations of parts, as hereinafter more particularly seti'orth, andspecifically pointed out in the claims.

In the said drawings, A represents a table of any suitable size or formon which to lay articles or books not in use on the racks.

B is a frame to which is fastened the table A, and which is providedwith any desired number of arms ct, each terminating in a ring o,formedintegral therewith, said frame B having at its center a hub c,bored out to receive the upper end of a rod d, and having a thumb-screwe for clamping it or retaining it while permitting it to revolve. Therod d slides telescopically within a tube B', provided with legs f toform a stand which is adapted to rest on the floor, said tube B be-Appiieetion tied July 8,1896.

`nt No. 568,139, dated september 22, 189e. sentire. 598,449. (No model.)

ing provided with a thumb-screw g for clampa ing the rod d when adjustedto the desired height.

O C represent the racks forsupporting the books. To the back of eachrack is secured the narrow metallic piece h, having a dovetailed way orgroove t', within which slide lips m at the ends of two plates or piecesD D, each of which is provided: on its inner side with a raised portionor circularlprotuberance k in the shape of a truncated cone, which' litsagainst one side of and projects into the ring b of the frame B. Thesepieces D D are held in place by a bolt E, extending through apertures'it therein and 'through the ring l? and having a thumb-nut l0 turningon its threaded end, whereby the ends of the two pieces DD opposite'tothe lips m can be `drawn tightly toward each other: to clamp themagainst the sides of the ring, a hinged joint being thus formed topermit the book- 4 rack C to be adjusted at any desired angle, while itsheight may be varied by sliding it up and down on thepieces D D. On theouter side of the ring Z) is a projection p, which forms a stop to limitthe movement of the rack on the hinge in that direction. The bolt E doesnot pass through the centers of the circular protuberances le, but isarranged eccentrically with respect to the same on the side toward theend opposite to the lips m that enter the dovetailed wayz' of the pieceh. `The holes n, through which the bolt E passes, are made slightlylarger than the bolt to permit play or loose motion.

The operation is as follows: Then the thumb-nut l0 is tightened upon thebolt E, the tendency is to draw the ends of the pieces D D oppositetothe lips m toward each other by reason of the bolt passingeccentrieally through therin g b, the pressure being thereby exerted insuch manner that the ends l5 of the circular protuberances 7c will bedrawn toward each other and their opposite ends separated, thus causingthe pieces D D to act as levers turning upon the portion of the ring bnearest to the piece 7L as a fulcrum,whereby the lips m are caused tobind more tightly in the dovetailed groove t'. Asthe tightening of thebolt E also increases the hinge friction between the ring b and thepieces D D it is obvious that the tightening of a single bolt IOO Willthus not only clamp the hinge, but Will simultaneously producesuiiicient friction between the pieces D D and the sides of thedovetailed groove t' to prevent any sliding movement of the rack Cafterit has been adjusted in position, and that any increased pressureat the hinge will be instantly transmitted to the sliding frictiondevice, and vice versa. In this manner the degree of friction may benicely regulated, so that When the hinge is adjusted so that it can bemoved by hand but not by the Weight of the book upon the rack thesliding friction device will also be sufficiently tight to prevent therack from being moved thereon by the same Weight, but neverthelesscapable of being easily moved up or down by the hand, thus rendering thebookrest extremely convenient for practical use. The table A is notessential, as the frame B may be made to extend out into the form of atable, if desired, and the arms a, having the rings b, instead of beingmounted on a hub supported by a stand, as shown, may be made separateand provided with suitable means for securing them to a table or othersupport.

What I claim as my invention,- and desire to secure by Letters Patent,is-

1. In a book-rest, the combination of a supportingarm, a book-rackhaving its back provided With a dovetailed Way or groove, a slideengaging said groove and pivoted at its opposite end to thesupporting-arm by means of a clamping-bolt, forming a hinge, said slidebeing composed of two separate pieces or members acting as levers andadapted to be drawn toward each other at their inner ends by the bolt toclamp the hinge and simultaneously separated at their opposite ends toclamp the same against the opposite sides of the dovetailed groove ofthe book-rack, substantially as described.

2. In a book-rest, the combination of a supporting-arm terminating in aring, pieces having conical raised portions or protuberances enteringthe sides of said ring, a rack having its back provided with adovetailed Way or groove engaged by said pieces, and aneccentrically-placed bolt passed through the said pieces and ring, forregulating both the hinge and sliding friction device of the book-rack,

substantially as set forth.

3. In combination, in a book-rest, a pivoted frame B having one or morearms terminating in rings b, pieces D D having conical raised surfacesor protuberances placed on the sides of and entering the rings b, a rackC' having its back provided with a dovetailed Way or groove engaging theextended outer ends of the pieces D D, andan eccentricallyplaced bolt Epassing through the pieces D D and ring b, substantially as and for thepurpose set forth.

Witness my hand this 6th day of July, A. D. 1896.

CHARLES F. HAYNES.

In presence of l?. E. TESCHEMACHER, CHARLES W. HAYNEs.

